mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.8 KiB
82 lines
2.8 KiB
[](https://godoc.org/github.com/steakknife/hamming) [](https://travis-ci.org/steakknife/hamming)
|
|
|
|
|
|
# hamming distance calculations in Go
|
|
|
|
Copyright © 2014, 2015, 2016, 2018 Barry Allard
|
|
|
|
[MIT license](MIT-LICENSE.txt)
|
|
|
|
## Performance
|
|
|
|
```
|
|
$ go test -bench=.
|
|
BenchmarkCountBitsInt8PopCnt-4 300000000 4.30 ns/op
|
|
BenchmarkCountBitsInt16PopCnt-4 300000000 3.83 ns/op
|
|
BenchmarkCountBitsInt32PopCnt-4 300000000 3.64 ns/op
|
|
BenchmarkCountBitsInt64PopCnt-4 500000000 3.60 ns/op
|
|
BenchmarkCountBitsIntPopCnt-4 300000000 5.72 ns/op
|
|
BenchmarkCountBitsUint8PopCnt-4 1000000000 2.98 ns/op
|
|
BenchmarkCountBitsUint16PopCnt-4 500000000 3.23 ns/op
|
|
BenchmarkCountBitsUint32PopCnt-4 500000000 3.00 ns/op
|
|
BenchmarkCountBitsUint64PopCnt-4 1000000000 2.94 ns/op
|
|
BenchmarkCountBitsUintPopCnt-4 300000000 5.04 ns/op
|
|
BenchmarkCountBitsBytePopCnt-4 300000000 3.99 ns/op
|
|
BenchmarkCountBitsRunePopCnt-4 300000000 3.83 ns/op
|
|
BenchmarkCountBitsInt8-4 2000000000 0.74 ns/op
|
|
BenchmarkCountBitsInt16-4 2000000000 1.54 ns/op
|
|
BenchmarkCountBitsInt32-4 1000000000 2.63 ns/op
|
|
BenchmarkCountBitsInt64-4 1000000000 2.56 ns/op
|
|
BenchmarkCountBitsInt-4 200000000 7.23 ns/op
|
|
BenchmarkCountBitsUint16-4 2000000000 1.51 ns/op
|
|
BenchmarkCountBitsUint32-4 500000000 4.00 ns/op
|
|
BenchmarkCountBitsUint64-4 1000000000 2.64 ns/op
|
|
BenchmarkCountBitsUint64Alt-4 200000000 7.60 ns/op
|
|
BenchmarkCountBitsUint-4 300000000 5.48 ns/op
|
|
BenchmarkCountBitsUintReference-4 100000000 19.2 ns/op
|
|
BenchmarkCountBitsByte-4 2000000000 0.75 ns/op
|
|
BenchmarkCountBitsByteAlt-4 1000000000 2.37 ns/op
|
|
BenchmarkCountBitsRune-4 500000000 2.85 ns/op
|
|
PASS
|
|
ok _/Users/bmf/Projects/hamming 58.305s
|
|
$
|
|
```
|
|
|
|
## Usage
|
|
|
|
```go
|
|
import 'github.com/steakknife/hamming'
|
|
|
|
// ...
|
|
|
|
// hamming distance between values
|
|
hamming.Byte(0xFF, 0x00) // 8
|
|
hamming.Byte(0x00, 0x00) // 0
|
|
|
|
// just count bits in a byte
|
|
hamming.CountBitsByte(0xA5), // 4
|
|
```
|
|
|
|
See help in the [docs](https://godoc.org/github.com/steakknife/hamming)
|
|
|
|
## Get
|
|
|
|
go get -u github.com/steakknife/hamming # master is always stable
|
|
|
|
## Source
|
|
|
|
- On the web: https://github.com/steakknife/hamming
|
|
|
|
- Git: `git clone https://github.com/steakknife/hamming`
|
|
|
|
## Contact
|
|
|
|
- [Feedback](mailto:barry.allard@gmail.com)
|
|
|
|
- [Issues](https://github.com/steakknife/hamming/issues)
|
|
|
|
## License
|
|
|
|
[MIT license](MIT-LICENSE.txt)
|
|
|
|
Copyright © 2014, 2015, 2016 Barry Allard
|
|
|